Professional brass, silicone grip, penis pump set with pressure gauge and penis cylinder.

ABS cylinder with measurement increments, quality brass pumping chamber, silicone hose with release valve, pressure says inside cylinder once detached.

Length : 22.8cm (9in) 

Inner Dia.: 5.7cm (2.25in).

Flanged base to sit snug against the pelvis, there is no donut included or designed to be used with this cylinder.